Jquery Class By Index !!

javascript - jQuery - get the index of a element with a certain class

var index = $("ul li.active").index(); .index() without parameters gives the index of the element with respect to it's siblings, which is what you want in this case. I want to find out the index (number in the list) of the item with the "active" class element.in this case the index would be 4 (or 3 if we're starting from 0)How can I do that?

.index() without parameters gives the index of the element with respect to it's siblings, which is what you want in this case.

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dom - Get an element by index in jQuery - Stack Overflow

There is another way of getting an element by index in jQuery using CSS :nth-of-type pseudo-class: I have an unordered list and the index of an li tag in that list. I have to get the li element by using that index and change its background color. Is this possible without looping the entire list? I mean, is there any method that could achieve this functionality?

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.index() | jQuery API Documentation

Index: 1. If we use a string as the .index() method's argument, it is interpreted as a jQuery selector string. The first element among the object's matched elements which also matches this selector is located. If no argument is passed to the .index() method, the return value is an integer indicating the position of the first element within the jQuery object relative to its sibling elements.

If .index() is called on a collection of elements and a DOM element or jQuery object is passed in, .index() returns an integer indicating the position of the passed element relative to the original collection.

If a selector string is passed as an argument, .index() returns an integer indicating the position of the first element within the jQuery object relative to the elements matched by the selector. If the element is not found, .index() will return -1.

The complementary operation to .get(), which accepts an index and returns a DOM node, .index() can take a DOM node and returns an index. Suppose we have a simple unordered list on the page:

If we retrieve one of the three list items (for example, through a DOM function or as the context to an event handler), .index() can search for this list item within the set of matched elements:

Similarly, if we retrieve a jQuery object consisting of one of the three list items, .index() will search for that list item:

Note that if the jQuery collection used as the .index() method's argument contains more than one element, the first element within the matched set of elements will be used.

If we use a string as the .index() method's argument, it is interpreted as a jQuery selector string. The first element among the object's matched elements which also matches this selector is located.

If we omit the argument, .index() will return the position of the first element within the set of matched elements in relation to its siblings:

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Using jQuery’s .index() Function | jQuery Learning Center

.index() is a method on jQuery objects that's generally used to search for a given element within the jQuery object that it's called on. This method has four different signatures with different semantics that can be confusing. This article covers details about how to understand the way .index() works with each signature. link.index() with No Arguments .index() is a method on jQuery objects that's generally used to search for a given element within the jQuery object that it's called on. This method has four different signatures with different semantics that can be confusing. This article covers details about how to understand the way .index() works with each signature.

In the first example, .index() gives the zero-based index of #foo1 within its parent. Since #foo1 is the second child of its parent, index() returns 1.

Note: Before jQuery 1.9, .index() only worked reliably on a single element, which is why we've used .first() on each of our examples. In jQuery 1.9+ this can be ignored, as the API was updated to define that it operates on the first element only.

When .index() is called with a string argument, there are two things to consider. First, jQuery will implicitly call .first() on the original jQuery object. It will find the index of the first element, not the last element in this case. This is inconsistent, so be careful here.

The second point to consider is that jQuery is querying the entire DOM using the passed in string selector and checking the index within that newly queried jQuery object. For example, when using .index( "div" ) in the last example above, jQuery is selecting all of the elements in the document, then searching for the index that contains the first element in the jQuery object .index() is called on.

In this case, the first element of the jQuery object that is passed into .index() is being checked against all of the elements in the original jQuery object. The original jQuery object, on the left side of .index(), is array-like and is searched from index 0 through length - 1 for the first element of the argument jQuery object.

In this case, the DOM element that's passed into .index() is being checked against all of the elements in the original jQuery object. Once all other cases are understood, this should be the simplest case. It is very similar to the previous case, except since the DOM element is passed directly, it is not taken from a jQuery object container.

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jQuery Misc index() Method - W3Schools

The index () method returns the index position of specified elements relative to other specified elements. The elements can be specified by jQuery selectors, or a DOM element. Note: If the element is not found, index () will return -1. If you want to report an error, or if you want to make a suggestion, do not hesitate to send us an e-mail:

:eq() Selector | jQuery API Documentation

As of jQuery 3.4, the :eq pseudo-class is deprecated. Remove it from your selectors and filter the results later using .eq (). The index-related selectors ( :eq (), :lt (), :gt (), :even, :odd) filter the set of elements that have matched the expressions that precede them. They narrow the set down based on the order of the elements within this As of jQuery 3.4, the :eq pseudo-class is deprecated. Remove it from your selectors and filter the results later using .eq().

The index-related selectors (:eq(), :lt(), :gt(), :even, :odd) filter the set of elements that have matched the expressions that precede them. They narrow the set down based on the order of the elements within this matched set. For example, if elements are first selected with a class selector (.myclass) and four elements are returned, these elements are given indices 0 through 3 for the purposes of these selectors.

Note that since JavaScript arrays use 0-based indexing, these selectors reflect that fact. This is why $( ".myclass:eq(1)" ) selects the second element in the document with the class myclass, rather than the first. In contrast, :nth-child(n) uses 1-based indexing to conform to the CSS specification.

Prior to jQuery 1.8, the :eq(index) selector did not accept a negative value for index (though the .eq(index) method did).

Apply three different styles to list items to demonstrate that :eq() is designed to select a single element while :nth-child() or :eq() within a looping construct such as .each() can select multiple elements.

Copyright 2021 OpenJS Foundation and jQuery contributors. All rights reserved. See jQuery License for more information. The OpenJS Foundation has registered trademarks and uses trademarks. For a list of trademarks of the OpenJS Foundation, please see our Trademark Policy and Trademark List. Trademarks and logos not indicated on the list of OpenJS Foundation trademarks are trademarks™ or registered® trademarks of their respective holders. Use of them does not imply any affiliation with or endorsement by them. OpenJS Foundation Terms of Use, Privacy, and Cookie Policies also apply. Web hosting by Digital Ocean | CDN by StackPath

How to Get Class List of an Element with jQuery

Answer: Use the jQuery attr() Method You can simply use the attr() method to get the class list i.e. list of all the classes that are assigned to an element using jQuery. The class names are space separated. You can simply use the attr() method to get the class list i.e. list of all the classes that are assigned to an element using jQuery. The class names are space separated.

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jQuery addClass() Method - W3Schools

Required. Specifies one or more class names to be added: function(index,currentclass) Optional. Specifies a function that returns one or more class names to be added. index - Returns the index position of the element in the set; currentclass - Returns the current class name of the selected element This method does not remove existing class attributes, it only adds one or more class names to the class attribute.

Change the class name of an elementHow to use addClass() and removeClass() to remove one class name, and add a new class name.

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How do I select an item using class or ID? - jQuery

This code selects an element with an ID of "myDivId". Since IDs are unique, this expression always selects either zero or one elements depending upon whether or not an element with the specified ID exists. 1. $ ( "#myDivId" ); This code selects an element with a class of "myCssClass". Since any number of elements can have the same class, this

5 jQuery.each() Function Examples - SitePoint

jQuery.each () Syntax. Let’s see the different modes in action. The following example selects every

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